Not much, make sure you use zlib to reduce payload size (also applies to
Firebird 3). This requires that fbclient.dll can load the zlib1.dll,
which in a default installation is *not* the case.
If you do a lot of bulk updates/inserts, switching to the batch API
might give some improvement for those operations. Other than that, there
were - as far as I recall - no protocol changes to reduce chattiness in
the protocol.
Mark
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Mark Rotteveel